Mechanism for admitting or shutting off steam for rotary motors.



No. 69l,04l. Patented 1an. I4, H902.

.L B. ZURA.

MEGHANISM FOR ADIMITTI'NGDB SHUTTING OFF STEAM yFOB ROTARY MUTBRS.

(Application led June 30, 1898.) (un Model.) a shetwshe'et |.A

TH: cams mns ce.. PMQTQLITHQ. WASHINGTON. n. c.

No. 69|,o4|. Patented Jan. r4, |902.

l.1. B. zunA. MEGHAMSM FUR DMITTING URSHUTTING UFF STEAM FR RTRY MOTBS.

(Appl'ication led hun 30, 1898.)

(No Model.)` 3 Sheets-Sheet 2.

No. s9`|,o4|.

J. B. zuRA. A G 0R SHUTTING OFF STEAM FUR H UTABY MOTORS.

. (Application med June so, 189e.) y 1 (No Model.) 3 Sheets-Sheet 3.

Pafented'rlan. I4, |902.

MECHANISM FUR ADMITTIN Wvz'fnesses. fnl/P11101' www' @www W' 'Amy NierenSTATES Artnr OFFICE.

JOSEF BRUNO ZURA, OF BERLIN, GERMANY.

MECHANISM FOR ADMITTING R SHUTTING OFF STEAM FOR ROTARY MOTORS.

SPECIFICATION forming part of Letters. Patent No. 691,041, dated January14, 19o2. application tiled June 30, 1898. Serial No. 684,901. (Nomodel.)

longer or a shorter time, according to the yield of work required of themotor, so lthat steam is always supplied to the motor unthrottled.Further, means are provided for suddenly and completely closing theslidevalve when the load is suddenly taken off the motor.

The mechanism of the invention comprises i a cam which by the extensionor contraction of its periphery for the time being determines the timeof full steam admission and complete-cutoff, the contraction andexpansion, or closing and opening, of said cam being eltected throughthe lever mechanism of the slide-valve and retained a longer or shortertime in either position.

In the accompanying drawings, Figure 1 is a cross-section of a rotarymotor with the invention applied thereto; Fig. 2, a vertical section online :c no of Fig. 1, parts similar to those shown on the left-hand sidebeing left out on the right-hand side; Figs. 3 and 4, respectively, afront View and a sectional view of the governor and parts in connectiontherewith on the main shaft, the section being approximately on line y yof Fig. 3. Fig. 5 is a View of the slide-valve lever mechanism. Figs. 6to 9 are details of the expanding and contracting cam above referred to.Figs. 10 to 12 are views of the parts employedforsuddenlyclosing theslide-valve. Figs. 13 and 14 show cam mechanism for actuating thealternator, but not forming part of the invention. Fig. 15 shows theelements severally illustrated in Figs. 6 to 11 as assembled and in theposition in which the cam Z holds the roller 'L' high and the cam 'ndoes not come into action. Fig. 16 shows the same elements also asassembled, but in the position in which the cam n comes into action.

a is the slide-valve for opening and closing the steam-admission port;b, the steam-chest in communication with the interior of thesteam-cylinder by passage c; CZ, a lever iiXed on the same spindle easthe slide CZ. Jointed to the lever CZ is a rod F, constructed in twopartsffg, jointed together.

g is an eye-bearing provided on the motorframe for carrying the leverZz, jointed to the part f2 of the rod F and carrying at one end a rollert' and at the other end acted against by the spring Zr.

Z is acam fixed on the main shaft and serving to regulate the steamadmission; Z', a guide-slot in the cam Z, in which slot the lengtheningpart Z2 engages with its curved lug Z3; m, a link connecting the jointof the partsff2 with the lever 'm' m2, carried on the motor-frame; m3, alug on the lever 'm' lm2,against which the cam n, Figs. 4, l1,and 12,acts when this latter is displaced by the-gov `ernor; n, a pivot on thecam n for engaging in the slot n2 of the disk o, Figs 4 and 12. In thecam n are curved slots n3, Fig. 11, in which engage the pivots n4, Figs6 and 7, of the cam Z.

The steam admission and eut-oft' is performed by the slide a., Fig.1,within the steamchest h, said slide being for 'this purpose moved toand fro from the rod F, which through the lever d turns the slide-rod eas soon as the lever h, jointed to the rod F, is moved by the cam Z whenthis comes in contact With the roller 1.', the movement of the lever ZLcorresponding to the form of the cam Z and the lever is maintained inthe position corresponding to the full-open or completelyclosedsteam-port c so long as the roller?) glides on the uniform peripheralsurface of the cam Z. Therefore the time during which the steam-port cis open or closed may be increased or diminished bylengthening orshortening the uniform or circular surface of the cam Z, which is doneby displacing the part Z2 along1 the slot Z. This displacementof thepart Z2 may be operated by the governor P. For this purpose there iskeyed on the main shaft a disk p, Figs. 3 and 4, which sets in rotationthe governor-weights p', xed on the outer ends of the levers p2, mountedto turn on the pivots p3, xed in the disk p. The op- IOC) p then move incontrary directions.

posite ends of said levers are connected by links q with a sleeve o,carried loose on the main shaft. This sleeve rotates with the disk 0;but it can also turn in the direction of the rotary movement separatedfrom the disk 0, and this occurs when the levers and weights of thegovernor P are moving or in action. When the weights 19 are thrownoutward by the centrifugal force, the levers p2 turn on the pivots 193,and thereby communicate, through the links q, an opposite turningmovementto the sleeve o', so that lthis latter and the disk v On thesleeve o is keyed the disk o, to which the cam part Z2 is attached byscrews, said cam part being guided bya projection Z3 thereon in the slotZ/ of the cam Z. When the disk o is displaced in a direction contrary tothe direction of movement of the main shaft, the cam part Z2 is alsodisplaced in the slot of the cam Z and the cam thereby lengthened. Theweights p and levers p2 are held in equilibrium by springs p4. Theroller i', Figs. 15 and 16, runs on the periphery in the cam Z and holdsthe lever d, and with this the opening in the slide-valve for theadmission of steam, so long in the same position as the roller Zcontinues to bear upon the larger concentric part of the cam Z. When theroller'Z comes to that part of the periphery of the cam Z at which itruns downward to the smaller part of the same, the position of the leverd and that ol' the steam-admission opening in the slide-valve changesand is held in this changed position so long as the roller i' runs uponthe smaller concentric part of the cam Z. If now by sliding'thelengthening part Z2 in the guide-slot Zi of the cam Zthe periphery ofthe latter is altered, so also is the duration oil' the steam admission.

The above-described cam n, Figs. 4, 1l, and 12, serves to completelyclose the steam-port. When the sleeve o is displaced by the governor Pagainst the cam Z, the cam n at a certain point of the displacementpasses, by reason of the oblique slots n3, Fig. 11, engaged b'ypivotsn4, Figs. 6 and 7, upward out of the path. By this movement of the cam nthe lever m fm2 is moved as the cam n strikes against the lug m3 andpresses it backward. In this movement of the lever m m2 the rod. F ispulled open at the joint of its two parts f f2, and the steam-slidethereby moved to close the steam-port c.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- 1. In rotary motors a mechanism for governing theadmission of unthrottled steam into the steam-cylinder,consisting in thecombination of a lever h which is in connection with the slide-valve athrough rod F and lever d, with the cam Z composed of two concentriccircular curves of different radius on which the cam part Z2 is radiallydisplaceable, and with a governor which is connected with the cam partZ2 for the purpose of varying the duration of the admission of theunthrottled steam into the steam-cylinder, said cam part Z2 beingconnected with the part operated by .the governor, substantially asdescribed and shown.

2. In rotary motors, a mechanism for governing the admission ofunthrottled steam into the steam-cylinder,consisting in the combinationof a lever h which is in connection with the slide-valve a through rod Fand lever (Z, with the lever m, m2, connected with the rod F lthroughthe link m, and with a mechanism for drawing open therod F at the jointof its two parts f', f2, consisting of the disk oconnected with thegovernor and of the cam n in movable connection with said disk o,substantially as described and shown.

3. In rotary motors, a mechanism for governing the admission ofunthrottled steam into the ste'am-cylinder,consisting in the combinationof a lever h'which is in connection with the slide-valve a through rod Fand lever CZ, with the cam Z on which the cam part Z2 is radiallydisplaceable for the purpose of varying the duration of the admission ofthe unthrottled steam into the steam-cylinder, and with a governorconnected with the cam part Z2 said governor consisting of a disk p onwhich are eccentrically carried the levers p2 carrying the weights p'and of a sleeve 0' carried on the same shaft as the diskp and in jointedconnection through links q with the levers p2, substantially asdescribed and shown.

In testimony that I claim the foregoing as myinvention I have signed myname in presence of two subscribing witnesses.

JOSEF BRUNO ZURA.

Witnesses:

C. H. DAY, HENRY HASPER.

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